<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      body {
        padding: 0;
        margin: 0;
        font: 1em/1.4 Cambria, Georgia, sans-serif;
        color: #333;
        background: #fff;
      }
      p {
        margin: 1em 0;
      }
      .content {
        width: 500px;
        padding: 0 0 50px;
        margin: 0 auto;
        position: relative;
        z-index: 1;
      }
      .triangle-isosceles {
        position: relative;
        padding: 15px;
        margin: 1em 0 3em;
        color: #000;
        background: #f3961c;
        background: -webkit-gradient(
          linear,
          0 0,
          0 100%,
          from(#f9d835),
          to(#f3961c)
        );
        background: -moz-linear-gradient(#f9d835, #f3961c);
        background: -o-linear-gradient(#f9d835, #f3961c);
        background: linear-gradient(#f9d835, #f3961c);
        filter: progid:DXImageTransform.Microsoft.gradient(GradinetType=0, startColorstr="#f9d835", endColorstr="#f3961c");
        -webkit-border-radius: 10px;
        -moz-border-radius: 10px;
        border-radius: 10px;
      }

      .triangle-isosceles:after {
        content: "";
        position: absolute;
        left: 50px;
        bottom: -15px;
        border-width: 15px 15px 0;
        border-style: solid;
        border-color: #f3961c transparent;
        display: block;
        width: 0;
      }
    </style>
  </head>
  <body>
    <div class="content">
      <p class="triangle-isosceles">This only needs one HTML element.</p>
    </div>
  </body>
</html>
